CN102806443B - Numerically-controlled processing method of nozzle housing piece - Google Patents

Numerically-controlled processing method of nozzle housing piece Download PDF

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Publication number
CN102806443B
CN102806443B CN201210290622.3A CN201210290622A CN102806443B CN 102806443 B CN102806443 B CN 102806443B CN 201210290622 A CN201210290622 A CN 201210290622A CN 102806443 B CN102806443 B CN 102806443B
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head
milling
workpiece
processing
cylindrical
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CN201210290622.3A
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CN102806443A (en
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魏鉴梅
何顺
金英卓
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沈阳黎明航空发动机(集团)有限责任公司
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Abstract

The invention discloses a numerically-controlled processing method of a nozzle housing piece. According to the method, a numerically-controlled machining/milling combined processing center is adopted and comprises two main shafts and an on-line measurement device; the workblank of the nozzle housing piece is a die-forged part, and the die-forged part is made of a nickel-based high-temperature alloy. The method comprises the following steps: designing a nozzle housing processing path; performing polishing treatment on the die-forged part to remove burrs from the die-parting face and end-face die-drawing taper; coarsely machining the tail part of the work piece; performing numerically-controlled machining/milling on the whole work piece; performing numerically-controlled fine machining of the head part of the work piece; cleaning and marking the work piece; and inspecting. The method provides the reasonable designs of processing path and processing method of the work piece as well as the processing positioning reference of the work piece, and completes the processing of the inner cavity, the outer circle, the lateral adapter, the positioning pin and other parts of the nozzle housing piece within one-step loading process. The method solves the problem that the die-forged part has a complex structure and a thin wall and has strict requirements for dimensional precision and positional precision; and overcomes the defects of long processing period, low production efficiency and poor dimensional precision and positional precision.

Description

A kind of numerical-control processing method of nozzle body workpiece
Technical field
The present invention relates to aircraft engine manufacturing technology field, be specifically related to a kind of numerical-control processing method of nozzle body workpiece.
Background technology
Nozzle body class part forging part processing structure complexity, wall are thin, dimensional accuracy and position accuracy demand very high, and the difficult processing of material, for example certain engine nozzle shell structure complexity, as shown in Figure 1, 2, blank is forging part, in Fig. 2,2 is workpiece afterbody cylindrical, 29 is burr, 6 is workpiece head cylindrical, and the difficult processing nickel base superalloy of material, owing to having four fuel inlet fittings and a lateral register pin 15 on this part, technical conditions require very high, and internal thread 7 requires to be not more than to the axiality of endoporus 3 (D) interior hole end surface 16 is not more than 0.02mm with respect to the perpendicularity of endoporus 4 (A), and the little endoporus 5 of endoporus 4 (A) and head is not more than with respect to the axiality of datum hole D (endoporus 3) respectively endoporus 3 (D) is not more than with the axiality of cylindrical 6 (H) four fuel inlet fittings are not more than with respect to the position degree of end face 1 (C) and cylindrical 6 (H) respectively originally adopt common equipment processing, take the equipment such as car, milling, brill, thread milling machine more, need altogether 22 procedures, machining process route is long, production cycle is long, the schedule requirement that is difficult to guarantee batch production, in process, tool wear is fast, and nozzle body inner cavity size precision and positional precision are difficult to guarantee.Therefore, in clamped one time process, complete the processing at multiple positions such as nozzle body inner chamber, cylindrical, four of sides joint and lateral register pin 15, be solution part process-cycle length, use the key problem in technology such as frock is many, part qualification rate is low.
Summary of the invention
For solving the problem that the process-cycle is long, production efficiency is low, dimensional accuracy is low and positional precision is low of the nozzle body class part forging part that blank is forging part, the invention provides a kind of numerical-control processing method of nozzle body workpiece.
The numerical-control processing method of nozzle body workpiece of the present invention adopts the numerical-control turn-milling Compositions of metal-working machines with two main shafts and on-line measurement device;
The blank of nozzle body workpiece of the present invention is forging part, and material is nickel base superalloy;
A numerical-control processing method for nozzle body workpiece, comprises the steps:
Step 1: design nozzle body machining process route;
The sequencing of this machining process route is: forging part, pincers worker polishing, rough turn afterbody, numerical-control turn-milling processing all, polishing sharp edge, numerical control finish turning head, polishing sharp edge, cleaning, head-stamp and final inspection;
Step 2: forging part is carried out to pincers worker polishing, destroy workpiece die joint burr and end face pattern draft;
Step 3: rough turned piece afterbody: with scroll chuck by clamping workpiece on lathe, with this workpiece head cylindrical and head end location, clamp head cylindrical, process thick benchmark, and remove endoporus surplus;
Step 4: numerical-control turn-milling processing all;
On turn-milling complex machining center, complete clamped one time and all surface that processes workpiece, guarantee the axiality of workpiece internal thread with respect to endoporus, and the position degree of side direction joint endoporus to head cylindrical and tail end face, and head cylindrical one side is reserved to allowance; Respectively as the radial and axial positioning datum of digital control processing, with two side planes of workpiece, as angle benchmark, adopt the method for centering angle benchmark to realize angle location workpiece afterbody cylindrical and end face;
Specifically workpiece machining area is assigned on two main shafts of turn-milling complex machining center, carried out numerical-control turn-milling processing, step is as follows:
Step 4.1: digital control processing on the first main shaft;
On the first main shaft, using workpiece tail end face as axial benchmark, afterbody cylindrical is as radial reference, and workpiece two side planes, as angle benchmark, adopt the method for centering angle benchmark to realize angle location, adopt hard dog chuck by clamping workpiece on the first main shaft;
The processing sequencing of workpiece on the first main shaft is:
Measure centering angle benchmark, rough turn head end and head cylindrical, finish turning head end and head cylindrical, rough mill lateral register pin, finish-milling lateral register pin, rough mill water jacket, finish-milling water jacket, centering, the little endoporus of starting drill portion, the little endoporus of heavy boring head, heavy boring head endoporus, the large inside groove of boring, right boring head endoporus, milling side banjo connector end face (four joints), the large joint cylindrical in milling side (two large joints), centering, bore the large joint inner via hole in side (two little joints), the large joint endoporus of the large joint cylindrical in finish-milling side and finish-milling side,
Step 4.2: digital control processing on the second main shaft;
On the second main shaft, take workpiece head cylindrical and head end as benchmark, adopt soft scroll chuck, and utilize lathe two main shafts can realize the function of static docking, by clamping workpiece to the second main shaft;
The sequencing of the processing of workpiece on the second main shaft is:
To pipe fitting (cylindrical and end face), tailstock end surface and afterbody cylindrical, car water jacket, centering, rough mill side joint cylindrical (two little joints), heavy boring head endoporus and internal thread bottom outlet, the little inside groove of boring, the little endoporus of right boring head endoporus and head, the little inside groove of boring, boring screw thread undercut, car internal thread, bore the little joint inner via hole in side (two little joints), the little joint cylindrical in finish-milling side (two little joints), the little joint endoporus in finish-milling side (two little joints), bore four radial holes and milling burr,
After numerical-control turn-milling processing all, polishing sharp edge;
Step 5: numerical control finish turning workpiece head on turn-milling complex machining center:
Adopt soft scroll chuck and special fixture clamping workpiece, with tail end face and Internal hole positioning, tension internal thread, processing work head part Roughing and fine machining, this special fixture is threaded multidiameter, its size is according to wanting the workpiece of clamping to determine;
The processing sequencing of finish turning workpiece head is:
Headstock end surface, the car conical surface, headstock portion cylindrical, car chamfering, thick fine finishining is each adopts one CNC turning tool, processes the sharp edge of then polishing according to machined parameters;
Step 6: to workpiece clean, head-stamp, and check.
Beneficial effect:
This method adopts the numerical-control turn-milling Compositions of metal-working machines with two main shafts and on-line measurement device to replace conventional equipment processing parts, the processing positioning datum of machining process route, process and the part of reasonable design part, in clamped one time process, complete nozzle body inner chamber, the cylindrical ' processing at multiple positions such as side joint and lateral register pin.Solved, dimensional accuracy thin by forging part processing structure complexity, wall and position accuracy demand very high, and the process-cycle of the unmanageable nozzle body class of material part is long, production efficiency is low, dimensional accuracy and positional precision are difficult to the processing difficult problem guaranteeing.Engine nozzle housing digital control processing new technology is through the production actual verification of small lot, process is stable, quality is obviously improved, part by one-step submits to qualification rate obviously to improve, production cycle by original 70 days/50 shorten to 40 days/50, production efficiency has improved 75%, fixture reduces to 1 cover by 8 original covers, the equipment using reduces to present 2 by original 14, and producers reduce to 5 people by 17 original people.
Accompanying drawing explanation
Fig. 1 is the cutaway view of part front view;
Fig. 2 is the top view of part front view;
Fig. 3 is the front view of part blank figure;
Fig. 4 is the top view of part blank figure;
Fig. 5 is the rough turn afterbody operation of specific embodiment of the invention part front view;
Fig. 6 is the rough turn afterbody operation of specific embodiment of the invention part top view;
Fig. 7 is that specific embodiment of the invention numerical-control turn-milling is processed whole operation front views;
Fig. 8 is that specific embodiment of the invention numerical-control turn-milling is processed whole operation top views;
Fig. 9 is specific embodiment of the invention numerical control finish turning head operation front view;
Figure 10 is specific embodiment of the invention numerical control finish turning head operation special fixture schematic diagram.
The specific embodiment
Below in conjunction with accompanying drawing, specific embodiment of the invention is described further.
Present embodiment adopts the numerical-control turn-milling Compositions of metal-working machines WFL M30-G with two main shafts and on-line measurement device to process at one time nozzle body overwhelming majority piece surface.
As shown in Figure 1, 2, nozzle body complex structure, processing dimension and positional precision are all higher, and internal thread 7 requires to be not more than to the axiality of endoporus 3 (D) interior hole end surface 16 is not more than 0.02mm with respect to the perpendicularity of head endoporus 4 (A), and the little endoporus 5 of head endoporus 4 and head is not more than with respect to the axiality of datum hole 3 (D) respectively head endoporus 3 (D) is not more than with the axiality of head cylindrical 6 (H) side surface of workpiece has four fuel inlet fittings, and wherein two is large joint, two points of little joints, and the endoporus of four fuel inlet fittings is not not more than with respect to the position degree of tail end face 1 (C) and head cylindrical 6 (H) the draw ratio of head endoporus 3 (D) is 4:1, and head endoporus 4 is darker, and the inner via hole 12 of little joint is radial hole, and this endoporus 12 connects with endoporus 3, and part minimum wall thickness (MINI W.) is 1.6mm, belongs to the part of thin wall and deep hole processing, rigidity is poor, clamping is yielding, and part material is nickel base superalloy, belongs to hard-cutting material, part blank is forging part, allowance is larger, and during cutting, tool wear is violent, and cutter life is low.The processing difficulties of part mainly concentrates in the processing of the large joint endoporus 9 of inner chamber and side and the little joint endoporus 11 in side.
Carry out the method that this method is processed nozzle body workpiece, concrete steps are:
Step 1: design nozzle body machining process route;
The sequencing of the process route that nozzle body is processed on conventional equipment is:
Forging part is carried out to pincers worker polishing ' rough turn tail end face 1 and afterbody cylindrical 2 ' rough turn head cylindrical 6 ' scribing by bench worker ' end face 8 ' two water jackets 13 of milling ' finish turning tail end face 1, afterbody cylindrical 2, head endoporus 3, head endoporus 4, the little endoporus 5 of head, large inside groove 17 and the little inside groove 18 of two large joints of milling; Milling burr; Scribing by bench worker; The end face 8 of two large joints of car, large joint endoporus 9, large joint inner via hole 10 and large joint cylindrical 19; The inner via hole 12 of the end face 8 of two little joints of car, little joint endoporus 11, little joint, little joint cylindrical 20; Car lateral register pin 15; Car inner chamber part (comprising headstock portion endoporus 3, head endoporus 4, the little endoporus 5 of head and internal thread bottom outlet); Bore four radial holes 21; Polishing sharp edge; Milling internal thread 7; Finish turning head cylindrical 6, the conical surface 22, the conical surface 23; Polishing sharp edge; Clean; Head-stamp; Final inspection; Totally 22 procedures, need 8 cover special fixtures.
For solving nozzle body blank surface, locate the unstable and large problem of inner chamber allowance, first on engine lathe, press shown in Fig. 5,6, use scroll chuck clamping, with head cylindrical 6 (H) and end face N location, clamp head cylindrical 6 (H), process thick benchmark B and C, and remove the little endoporus 5 part surpluses of head.Afterbody cylindrical 2 (B) and tail end face 1 (C) are as the radial and axial positioning datum (seeing Fig. 3,4) of digital control processing, with two side planes 24 of blank as angle benchmark G, centering benchmark, on turn-milling complex machining center, realize clamped one time processing all surface, to guarantee that internal thread 7 is with respect to the axiality of head endoporus 3, and large joint endoporus 9, the position degree (see Fig. 1) of little joint endoporus 11 to head cylindrical 6 (H) and tail end face 1 (C).For preventing the thin clamping deformation problem of part wall, stay the allowance of 1.2mm to carry out fine finishining head cylindrical 6 (H) one side, by the process route sequencing after the process route optimization of processing on conventional equipment, be:
Forging part; Pincers worker polishing; The little endoporus 5 of rough turn tail end face 1, afterbody cylindrical 2 and head; Numerical-control turn-milling processing all; Polishing sharp edge; Numerical control finish turning head cylindrical 6, the conical surface 22 and the conical surface 23; Polishing sharp edge; Clean; Head-stamp; Final inspection;
Process route after optimization is merged into 1 procedure by 14 original procedures, makes a threaded multidiameter by oneself as special fixture, has saved 7 sleeve clamps.
Step 2: forging part is carried out to pincers worker polishing, destroy workpiece die joint burr and end face pattern draft;
Step 3: rough turned piece afterbody: as shown in Figure 6, with scroll chuck by clamping workpiece on lathe, as shown in Fig. 3, Fig. 5, with this workpiece head cylindrical 6 (H) and end face N location, clamp head cylindrical 6 (H), process thick benchmark B and C, and remove endoporus surplus;
Step 4: all, operation as shown in Figure 7,8 in numerical-control turn-milling processing;
On turn-milling complex machining center, complete clamped one time and all surface that processes workpiece, guarantee the axiality of workpiece internal thread with respect to endoporus, and the position degree of side joint endoporus to head cylindrical and tail end face, and for preventing the thin clamping deformation that causes of workpiece wall, head cylindrical H one side is reserved to allowance and carry out essence; Work;
Known according to the design feature of nozzle body (seeing shown in Fig. 1,2), nozzle body comprises head endoporus 3 (D) (two sections), head endoporus 4 (A), large inside groove 17, little inside groove 18, internal thread 7, head cylindrical 6 (H), afterbody cylindrical 2 (B), large joint endoporus 9, little joint endoporus 11 (totally 2 large joints and 2 little joints) and lateral register pin 15.
According to numerical-control turn-milling Compositions of metal-working machines, be the feature of two main shafts, two main shafts only have a hard dog chuck and a soft dog chuck, and machining area is assigned on two main shafts and is processed.On the first main shaft, owing to there is no soft dog chuck, can only adopt hard dog chuck clamping, but hard dog chuck cannot be realized with tail end face 1 (C) and locating, axial benchmark C (tail end face 1) can only be converted to end face 25 (F), with two side planes 24 (G) of blank, as angle centering benchmark, see shown in Fig. 3,4.
Specifically workpiece machining area is assigned on two main shafts of turn-milling complex machining center, carried out numerical-control turn-milling processing, step is as follows:
Step 4.1: the first main spindle numerical control processing;
On the first main shaft, using workpiece end face 25 as axial benchmark F, afterbody cylindrical 2 is as radial reference, and workpiece two side planes 24 are as angle benchmark G, adopt the method for centering angle benchmark to realize angle location, adopt hard dog chuck by clamping workpiece on the first main shaft;
The processing route sequencing of workpiece on the first main shaft is:
Measured angular is to benchmark G; Rough turn head end 26 and head cylindrical 6 (H); Finish turning head end 26 and head cylindrical 6 (H); Rough mill lateral register pin 15; Finish-milling lateral register pin 15; Rough mill water jacket 13; Finish-milling water jacket 13; Centering; The little endoporus 5 of starting drill portion; The little endoporus 5 of heavy boring head; Heavy boring head endoporus 4 (A); The large inside groove 17 of boring; Right boring head endoporus 3 (D); The end face 8 of four fuel inlet fittings of milling; Two large joint cylindricals 19 of milling; Centering; Bore the inner via hole 10 of two large joints; The cylindrical 19 of two large joints of finish-milling; The endoporus 9 of two large joints of finish-milling.
Step 4.2: the second main spindle numerical control processing;
On the second main shaft, take workpiece head cylindrical 6 (H) and head end 26 as benchmark, adopt soft scroll chuck, and utilize lathe two main shafts can realize the function of static docking, by clamping workpiece to the second main shaft;
The processing route sequencing of workpiece on the second main shaft is:
To pipe fitting (head cylindrical 6 (H) and head end 26 (K)); Tailstock end surface 1 (C) and afterbody cylindrical 2 (B); Car water jacket 14; Centering; Rough mill the cylindrical 20 of two little joints; Heavy boring head endoporus 4 (A); Boring head portion endoporus 3 (D) (two sections) and internal thread bottom outlet; The little inside groove 18 of boring; Right boring head endoporus 3 (D), head endoporus 4 (A) and the little endoporus 5 of head; The little inside groove 18 of boring; Boring screw thread undercut 27; Car internal thread 7; Bore the inner via hole 12 of two little joints; The cylindrical 20 of two little joints of finish-milling; The endoporus 11 and 12 of two little joints of finish-milling; Bore four radial holes 21; Milling burr 29.
Digital control processing pre-test angle benchmark adopts the on-line measurement function of numerical-control turn-milling Compositions of metal-working machines WFL M30-G, distinguishes two side planes 24 on gaging nozzle casing blank part zero points as C axle with online gauge head, and its working process parameter is in Table 1,
Table 1 working process parameter
: rapid 5: numerical control finish turning workpiece head on turn-milling complex machining center;
Finish turning workpiece head operation as shown in Figure 9, adopt soft scroll chuck and special fixture clamping workpiece, with benchmark C (tail end face 1) and benchmark D (head endoporus 3) location, tension internal thread 7 (S), processing work head part Roughing and fine machining, as shown in figure 10, this special fixture is threaded multidiameter, and its size is according to wanting the workpiece of clamping to determine;
The processing route sequencing of finish turning workpiece head is:
Headstock end surface 26; The car conical surface 23; The car conical surface 22; Headstock portion cylindrical 6 and car chamfering 28.Thick fine finishining is each adopts one CNC turning tool, adopts the blade of ISCAR CNMG120404-TF IC907, and machined parameters is:
Roughing: spindle revolutions S=150r/min, Smax=700r/min, feeding F=0.1mm/min, cutting depth α p=1.2mm;
Fine finishining: spindle revolutions S=1200r/min, feeding F=0.1mm/min, cutting depth α p=0.2mm;
According to machined parameters, process the sharp edge of then polishing;
Step 6: to workpiece clean, head-stamp, and check;
Matting adopts kerosene to clean.

Claims (2)

1. the numerical-control processing method of a nozzle body workpiece, employing has the numerical-control turn-milling Compositions of metal-working machines of two main shafts and on-line measurement device, and the blank of nozzle body workpiece is forging part, and this forging part material is nickel base superalloy, it is characterized in that, the method comprises the steps:
Step 1, design nozzle body machining process route;
The sequencing of this machining process route is, forging part, pincers worker polishing, rough turn afterbody, numerical-control turn-milling processing all, polishing sharp edge, numerical control finish turning head, polishing sharp edge, cleaning, head-stamp and final inspection;
Step 2, carries out pincers worker polishing to forging part, destroys workpiece die joint burr and end face pattern draft;
Step 3, rough turned piece afterbody, with scroll chuck by clamping workpiece on lathe, with this workpiece head cylindrical and head end location, clamp head cylindrical, process thick benchmark, and remove endoporus surplus;
Step 4, numerical-control turn-milling processing is all;
Numerical-control turn-milling processing is all specifically assigned to workpiece machining area on two main shafts of machining center, carries out numerical-control turn-milling processing, and step is as follows,
Step 4.1, the first main spindle numerical control processing;
On the first main shaft, using workpiece tail end face as axial benchmark, afterbody cylindrical is as radial reference, and workpiece two side planes, as angle benchmark, adopt the method for centering angle benchmark to realize angle location, adopt hard dog chuck by clamping workpiece on the first main shaft;
The processing sequencing of workpiece on the first main shaft be,
Measure centering angle benchmark, rough turn head end and head cylindrical, finish turning head end and head cylindrical, rough mill lateral register pin, finish-milling lateral register pin, rough mill water jacket, finish-milling water jacket, centering, the little endoporus of starting drill portion, the little endoporus of heavy boring head, heavy boring head endoporus, the large inside groove of boring, right boring head endoporus, four fuel inlet fitting end faces of milling, the cylindrical of two large joints of milling, centering, bore the inner via hole of two large joints, the endoporus of the cylindrical of two large joints of finish-milling and two large joints of finish-milling,
Step 4.2, digital control processing on the second main shaft;
On the second main shaft, take workpiece head cylindrical and head end as benchmark, adopt soft scroll chuck, and utilize lathe two main shafts can realize the function of static docking, by clamping workpiece to the second main shaft;
The sequencing of the processing of workpiece on the second main shaft is,
Cylindrical to pipe fitting, tailstock end surface and afterbody cylindrical, car water jacket, centering, the cylindrical of rough milling two little joints, heavy boring head endoporus and internal thread bottom outlet, the little inside groove of boring, right boring head endoporus and the little endoporus of head, the little inside groove of boring, boring screw thread undercut, car internal thread, the inner via hole that bores two little joints, two little joints of finish-milling, the inner via hole of two little joints of finish-milling, four radial holes of brill and milling burr;
After numerical-control turn-milling processing all, polishing sharp edge;
Step 5, numerical control finish turning workpiece head on turn-milling complex machining center;
Adopt soft scroll chuck and special fixture clamping workpiece, with tail end face and head Internal hole positioning, tension internal thread, processing work head part Roughing and fine machining, this special fixture is threaded multidiameter;
The processing sequencing of finish turning workpiece head is,
Headstock end surface, the car conical surface, headstock portion cylindrical, car chamfering, thick fine finishining is each adopts one CNC turning tool, processes the sharp edge of then polishing according to machined parameters;
Step 6, to workpiece clean, head-stamp, and check.
2. the numerical-control processing method of nozzle body workpiece according to claim 1, is characterized in that, the cleaning described in step 6 adopts kerosene.
CN201210290622.3A 2012-08-14 2012-08-14 Numerically-controlled processing method of nozzle housing piece CN102806443B (en)

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